MSD 8677 Adjustable RPM Module is a high-performance ignition coil designed to deliver stronger spark energy for improved starting, throttle response, and high-rpm performance. Robust construction supports reliable operation in demanding conditions.

Compatible with a range of ignition systems including points, electronic, and performance setups. Features such as high-dielectric towers and quality windings help maximize output and durability.

A proven upgrade for street or race engines seeking better ignition performance and consistency.